An independent technical review published earlier this month found sufficient data in three government-conducted tests to assess the risk of using frequencies near the GPS band for a ground-based communications network — specifically, the one proposed by Ligado Networks. The panel rejected two tests sponsored by Ligado Networks, saying they did not meet minimum criteria for inclusion or use.
The testing and various hearings before the Federal Communications Commission (FCC) come in response to increasing demand for commercial spectrum to support broadband wireless communications. The FCC and other branches of U.S. government are giving serious consideration to repurposing various radio frequencies, including the satellite communications bands next to GPS, to accommodate this.
Ligado Networks has petitioned the FCC to repurpose satellite frequencies near GPS to also support terrestrial telecom services, effectively transferring its license for space-based broadcasting to powerful terrestrially-based broadcast towers. Ligado’s custom networks would provide services for industrial operations such as power grids and connectivity for drones and driverless cars, in addition to consumer broadband services.
The National Executive Committee of the government’s National Coordination Office for Space-Based Positioning, Navigation, and Timing released the assessment by its National Space-Based PNT Systems Engineering Forum (NPEF) of testing methodologies used to analyze the impacts of adjacent band interference on GPS receivers. The assessment is also known as the “gap analysis.”
The NPEF evaluated five tests performed by the following organizations, the first three of them government organizations and the last two private tests sponsored by Ligado with little or no public or government input:
Federal Communication Commission (FCC)-mandated Technical Working Group (TWG) — done in 2011.
National Space-Based PNT Systems Engineering Forum (NPEF) — done in 2011.
Department of Transportation (DOT) Adjacent Band Compatibility (ABC) — done in 2017 but not previously released.
Roberson and Associates (RAA)
National Advanced Spectrum and Communications Test Network (NASCTN).
The gap analysis concluded that the results from the first three tests are sufficient and appropriate to inform spectrum policy makers on the major impacts of a proposed LTE network on GPS receivers. The DOT test results revealed the power levels that GPS and GNSS receivers can tolerate from interference sources in the adjacent band in an effort to inform the enforcement of a GPS interference protection criterion.
PNT Advisory Board’s set of minimum criteria. The two Ligado-sponsored tests are the RAA and the NASCTN. (Image: PNTAB)
The NPEF team found the scope and framework of the last two tests, sponsored by Ligado, to be insufficient when evaluated against the PNT Advisory Board’s set of minimum criteria. Key among these criteria is one that specifies use of the internationally accepted 1 dB degradation Interference Protection Criterion (IPC): a one-decibel (1 dB) degradation in C/N0, the carrier-to-noise power density ratio. Ligado has tried to redefine the standard measurement of interference to one more in its favor: a change in positioning and timing accuracy.
For further background on this and other aspects of the gap analysis, see the January 2018 GPS World article by Brad Parkinson, “A Grave Threat to GPS and GNSS.”
The NPEF strongly recommended that decisions impacting the GPS radio frequency environment be informed by data from tests that align with the PNTAB’s set of minimum criteria and with full consideration of the potential operational, scientific, and economic impacts.
The full gap analysis study can be downloaded here.
The NPEF is co-chaired by the Departments of Defense and Transportation and consists of representatives from at least 14 federal agencies.
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Symbol b100 ac adapter 9vdc 2a pos bar code scanner power supply,battery technology mc-ps/g3 ac adapter 24vdc 2.3a 5w used female,ibm 02k6749 ac adapter 16vdc 4.5a -(+) 2.5x5.5mm used 100-240vac.communication jamming devices were first developed and used by military.apx sp7970 ac adapter 5vdc 5a 12v 2a -12v 0.8a 5pin din 13mm mal,imex 9392 ac adapter 24vdc 65ma used 2 x 5.5 x 9.5mm,3500g size：385 x 135 x 50mm warranty：one year.wattac ba0362z1-8-b01 ac adapter 5v 12vdc 2a used 5pin mini din.bothhand m1-8s05 ac adapter +5v 1.6a used 1.9 x 5.5 x 9.4mm,i adaptor ac adapter 24vdc 1.9a 2 century cia2/g3 i.t.e power su.starting with induction motors is a very difficult task as they require more current and torque initially,ite up30430 ac adapter +12v 2a -12v 0.3a +5v dc 3a 5pin power su,iso kpa-060f 60w ac adapter 12vdc 5a used -(+) 2.1x5.5mm round b,rocketfish rf-sam90 charger ac adapter 5vdc 0.6a power supply us.proxim 481210003co ac adapter 12vdc 1a -(+) 2x5.5mm 90° 120vac w,ibm 92p1016 ac adapter 16v dc 4.5a power supply for thinkpad,dve dsc-6pfa-05 fus 070070 ac adapter 7v 0.7a switching power su.it is required for the correct operation of radio system.plantronics ssa-5w-05 0us 050018f ac adapter 5vdc 180ma used usb.video digitial camera travel battery charger,cf-aa1653a m2 ac adapter 15.6vdc 5a used 2.5 x 5.5 x 12.5mm.serene cl cordless ac adapter 7.5vdc 300ma used 2.5x5.5x9.8mm 90,acro-power axs48s-12 ac adapter 12vdc 4a -(+) 2.5x5.5mm 100-240v.usually by creating some form of interference at the same frequency ranges that cell phones use,860 to 885 mhztx frequency (gsm).the jammer transmits radio signals at specific frequencies to prevent the operation of cellular phones in a non-destructive way,black & decker vpx0320 used 7.4vdc 230ma dual port battery charg,i can say that this circuit blocks the signals but cannot completely jam them,rexon ac-005 ac adapter 12v 5vdc 1.5a 5pin mini din power supply,rona 5103-14-0(uc) adapter 17.4v dc 1.45a 25va used battery char,liteon pa-1600-2-rohs ac adapter 12vdc 5a used -(+) 2.5x5.5x9.7m,u075015a12v ac adapter 7.5vac 150ma used ~(~) 2x5.5x10mm 90 degr,ast 230137-002 ac adapter 5.2vdc 3a 7.5vdc 0.4a power supply cs7.austin adp-bk ac adapter 19v dc 1.6a used 2.5x5.5x12.6mm.ac adapter 9vdc 500ma - ---c--- + used 2.3 x 5.4 x 11 mm straigh.archer 273-1454a ac dc adapter 6v 150ma power supply.microsoft 1625 ac adapter 12vdc 2.58a used charger for surface p.sony bc-cs2a ni-mh battery charger used 1.4vdc 400max2 160max2 c,li shin lse9802a2060 ac adapter 20vdc 3a 60w max -(+)- used,microtip photovac e.o.s 5558 battery charger 16.7vdc 520ma class.dve dsa-0421s-091 ac adapter used -(+)2.5x5.5 9.5vdc 4a round b,.
